Tab Volume Booster

About

Tab Volume Booster lets you make any browser tab louder — up to 6× — or quieter, all the way down to silence, with one slider.

• Boost quiet videos, calls, lectures, or streams above 100%.
• Turn a backing track DOWN below your instrument — great for practising along (e.g. Chordify), where you want the song quiet under your guitar.
• Fullscreen-friendly: on YouTube and most sites it adjusts the page's own audio, so native fullscreen keeps working while boosted.
• Per-tab: each tab remembers its own level; nothing is shared, and it's forgotten when you close the tab.
• Robust: survives page reloads, follows the video when a player swaps it, and has a built-in limiter to tame distortion on hard boosts.
• One-click reset back to normal.

Privacy: runs entirely on your device. No network requests, no analytics, no ads, no data collected.

Open source (GPL-3.0): https://github.com/marcanxo/tab-volume-booster

Note: DRM-protected audio (Netflix, Spotify, Disney+, etc.) can't be boosted — that's a browser restriction, not a bug.